🤑 Join the Treehouse affiliate program and earn 25% commission!

🌟 Dreaming of a bright future? 🎓 Ask about the Treehouse Scholarship program! 🚀

A new Figma course has dropped!

🫡 Treehouse for Military offers discounts to Veterans, service members and their families!

Semen Zadorozhnyi

St. Petersburg City

Open to Work

8,515

Total Points

•
3,553

Android

3539 pts
Achievements

14 pts
Forum
•
1,276

Java

1276 pts
Achievements

0 pts
Forum
•
218

Development Tools

218 pts
Achievements

0 pts
Forum
•
166

HTML

166 pts
Achievements

0 pts
Forum
•
92

Databases

92 pts
Achievements

0 pts
Forum
•
15

CSS

15 pts
Achievements

0 pts
Forum

Points are earned whenever you take an important action on Treehouse.
Learn more about when and how points are earned.

Skills & Experience

Company

Ltd. REKSOFT
Job Title

Java Developer
Spoken Languages
- Russian
- English

108 Achievements

Achievement
Is This Thing On?

Kotlin for Java Developers

Achieved
Jul 5, 2017
Achievement
Putting It All Together

Kotlin for Java Developers

Achieved
Jul 5, 2017
Achievement
Modelling Solitaire

Kotlin for Java Developers

Achieved
Jul 4, 2017
Achievement
Hello Kotlin!

Kotlin for Java Developers

Achieved
Jul 1, 2017
Achievement
File Uploads and Entity Updates in Spring + Hibernate

Spring with Hibernate

Achieved
Jun 16, 2017
Achievement
Getting Started with CRUD in Spring + Hibernate

Spring with Hibernate

Achieved
Jun 6, 2017
Achievement
Data-Driven Application Design

Spring with Hibernate

Achieved
Jun 5, 2017
Achievement
Integrating Hibernate with Spring

Spring with Hibernate

Achieved
Jun 5, 2017
Achievement
Writing Great Swift

API Design Guidelines in Swift

Achieved
Jun 4, 2017
Achievement
Access Control

Intermediate Swift

Achieved
Jun 3, 2017
Achievement
Memory Management in Swift

Intermediate Swift

Achieved
Jun 3, 2017
Achievement
Value Semantics, Type Methods and Inheritance

Intermediate Swift

Achieved
May 25, 2017
Achievement
Object Initialization

Intermediate Swift

Achieved
May 23, 2017
Achievement
Refactoring Our Code (objc)

Build a Playlist Browser with Objective-C

Achieved
May 18, 2017
Achievement
Building the Master and Detail Views (objC)

Build a Playlist Browser with Objective-C

Achieved
May 17, 2017
Achievement
Deploying to a Device (ObjC)

Build a Simple iPhone App with Objective-C

Achieved
May 15, 2017
Achievement
Debugging Our App (ObjC)

Build a Simple iPhone App with Objective-C

Achieved
May 15, 2017
Achievement
Improving Our User Interface (ObjC)

Build a Simple iPhone App with Objective-C

Achieved
May 14, 2017
Achievement
Getting Started with Xcode (ObjC)

Build a Simple iPhone App with Objective-C

Achieved
May 12, 2017
Achievement
Immersive Examples

Objective-C Basics

Achieved
May 6, 2017
Achievement
Scope and Loops

Objective-C Basics

Achieved
May 5, 2017
Achievement
More Operators

Objective-C Basics

Achieved
May 5, 2017
Achievement
Using the MVC Architecture with Spring

Spring Basics

Achieved
May 5, 2017
Achievement
Modeling, Storing, and Presenting Data with Spring

Spring Basics

Achieved
May 5, 2017
Achievement
Operators and Conditionals

Objective-C Basics

Achieved
May 4, 2017
Achievement
Creating Spring Controllers and Thymeleaf Views

Spring Basics

Achieved
May 3, 2017
Achievement
Data Types and Variables

Objective-C Basics

Achieved
May 2, 2017
Achievement
Intro to Objective-C

Objective-C Basics

Achieved
May 2, 2017
Achievement
Spring Components and Configuring Our App

Spring Basics

Achieved
May 2, 2017
Achievement
Setting Up Your Local Environment for Spring Development

Spring Basics

Achieved
May 2, 2017
Achievement
Java's Functional Toolset

Introduction to Functional Programming

Achieved
Apr 30, 2017
Achievement
Reduction and Aggregation

Introduction to Functional Programming

Achieved
Apr 30, 2017
Achievement
Meet Streams

Introduction to Functional Programming

Achieved
Apr 29, 2017
Achievement
User Messages in Spring

Spring with Hibernate

Achieved
Apr 28, 2017
Achievement
Intents and Multiple Activities

Build an Interactive Story App

Achieved
Apr 26, 2017
Achievement
Tuning the User Interface

Build an Interactive Story App

Achieved
Apr 25, 2017
Achievement
User Input in Android

Build an Interactive Story App

Achieved
Apr 25, 2017
Achievement
Data, Databases and SQL

SQL Basics

Achieved
Apr 23, 2017
Achievement
Diving into Web Development

Intro to Java Web Development with Spark

Achieved
Apr 21, 2017
Achievement
GET and POST Requests in a Browser

HTTP Basics

Achieved
Apr 20, 2017
Achievement
Introduction to HTTP

HTTP Basics

Achieved
Apr 20, 2017
Achievement
How To Test

Unit Testing in Java

Achieved
Apr 19, 2017
Achievement
Why Test

Unit Testing in Java

Achieved
Apr 19, 2017
Achievement
Loading Data From a Resource

Build a Vending Machine App in Swift

Achieved
Apr 13, 2017
Achievement
Modeling an Interface

Build a Vending Machine App in Swift

Achieved
Apr 11, 2017
Achievement
View Controllers and Views

Build a Simple iPhone App with Swift

Achieved
Apr 5, 2017
Achievement
Getting Started with iOS Development

Build a Simple iPhone App with Swift

Achieved
Apr 5, 2017
Achievement
Class Inheritance

Object-Oriented Swift

Achieved
Apr 5, 2017
Achievement
Classes in Swift

Object-Oriented Swift

Achieved
Apr 5, 2017
Achievement
Adding Power to Functions

Functions in Swift

Achieved
Apr 5, 2017
Achievement
Control Flow With Conditional Statements

Swift Collections and Control Flow

Achieved
Apr 5, 2017
Achievement
Control Flow With Loops

Swift Collections and Control Flow

Achieved
Apr 5, 2017
Achievement
Running Apps on a Device

Build a Simple iPhone App with Swift

Achieved
Apr 1, 2017
Achievement
Structs As Data Models

Build a Simple iPhone App with Swift

Achieved
Mar 31, 2017
Achievement
Differentiating Between Objects

Object-Oriented Swift

Achieved
Mar 26, 2017
Achievement
Introducing Services

Threads and Services

Achieved
Mar 24, 2017
Achievement
Threads in Android

Threads and Services

Achieved
Mar 24, 2017
Achievement
Complex Data Structures

Object-Oriented Swift

Achieved
Mar 22, 2017
Achievement
Interacting with Google+ APIs

Google Play Services

Achieved
Mar 17, 2017
Achievement
Connecting to Play Services

Google Play Services

Achieved
Mar 15, 2017
Achievement
Interacting with Your API

Google Play Services

Achieved
Mar 14, 2017
Achievement
Adding Play Services to Your App

Google Play Services

Achieved
Mar 14, 2017
Achievement
Exterminator

Achieved
Mar 14, 2017
Achievement
Dictionaries in Swift

Swift Collections and Control Flow

Achieved
Feb 25, 2017
Achievement
Functions in Swift

Functions in Swift

Achieved
Feb 23, 2017
Achievement
Using SQLite for Structured Data

Android Data Persistence

Achieved
Feb 21, 2017
Achievement
Key-Value Saving with SharedPreferences

Android Data Persistence

Achieved
Feb 21, 2017
Achievement
File Storage

Android Data Persistence

Achieved
Feb 21, 2017
Achievement
Introduction to Collections

Swift Collections and Control Flow

Achieved
Feb 20, 2017
Achievement
Introduction to Data Persistence

Android Data Persistence

Achieved
Feb 20, 2017
Achievement
Swift Operators

Swift Basics

Achieved
Feb 19, 2017
Achievement
Swift Types

Swift Basics

Achieved
Feb 19, 2017
Achievement
An Introduction to Swift Programming

Swift Basics

Achieved
Feb 19, 2017
Achievement
Activity Transitions: Advanced Topics

Animations and Transitions

Achieved
Feb 17, 2017
Achievement
Shared Element Transitions

Animations and Transitions

Achieved
Feb 17, 2017
Achievement
Transitions Framework

Animations and Transitions

Achieved
Feb 17, 2017
Achievement
Animation Basics

Animations and Transitions

Achieved
Feb 16, 2017
Achievement
Tablet Time

Android Fragments

Achieved
Feb 10, 2017
Achievement
Ingredients and Directions

Android Fragments

Achieved
Feb 10, 2017
Achievement
Managing Fragments

Android Fragments

Achieved
Feb 9, 2017
Achievement
Introducing Fragments

Android Fragments

Achieved
Feb 8, 2017
Achievement
The Project

Android Activity Lifecycle

Achieved
Feb 7, 2017
Achievement
Introducing SharedPreferences

Android Activity Lifecycle

Achieved
Feb 4, 2017
Achievement
The Activity Lifecycle

Android Activity Lifecycle

Achieved
Feb 4, 2017
Achievement
Acting on List Item Taps

Android Lists and Adapters (2015)

Achieved
Feb 3, 2017
Achievement
Lists with RecyclerViews

Android Lists and Adapters (2015)

Achieved
Feb 2, 2017
Achievement
Using Parcelable Data

Android Lists and Adapters (2015)

Achieved
Jan 31, 2017
Achievement
Custom ListViews

Android Lists and Adapters (2015)

Achieved
Jan 30, 2017
Achievement
Standard ListViews

Android Lists and Adapters (2015)

Achieved
Jan 30, 2017
Achievement
Updating the Data Model

Android Lists and Adapters (2015)

Achieved
Jan 24, 2017
Achievement
Hooking up the Model to the View

Build a Weather App (2015)

Achieved
Jan 20, 2017
Achievement
Building the Weather UI

Build a Weather App (2015)

Achieved
Jan 19, 2017
Achievement
Working with JSON

Build a Weather App (2015)

Achieved
Jan 19, 2017
Achievement
Concurrency and Error Handling

Build a Weather App (2015)

Achieved
Jan 19, 2017
Achievement
Networking

Build a Weather App (2015)

Achieved
Jan 18, 2017
Achievement
Exploring an API

Build a Weather App (2015)

Achieved
Jan 18, 2017
Achievement
Finishing the User Interface

Build an Interactive Story App (Retired)

Achieved
Jan 18, 2017
Achievement
The Model-View-Controller Pattern

Build an Interactive Story App (Retired)

Achieved
Jan 17, 2017
Achievement
HTML First

How to Make a Website

Achieved
Jan 16, 2017
Achievement
Intents and Multiple Activities

Build an Interactive Story App (Retired)

Achieved
Jan 16, 2017
Achievement
Beginning HTML and CSS

How to Make a Website

Achieved
Jan 15, 2017
Achievement
User Input

Build an Interactive Story App (Retired)

Achieved
Jan 15, 2017
Achievement
Testing and Debugging

Build a Simple Android App

Achieved
Jan 15, 2017
Achievement
Improving Our Code

Build a Simple Android App

Achieved
Jan 15, 2017
Achievement
Basic Android Programming

Build a Simple Android App

Achieved
Jan 14, 2017
Achievement
Creating the Screen Layout

Build a Simple Android App

Achieved
Jan 13, 2017
Achievement
Getting Started with Android

Build a Simple Android App

Achieved
Jan 13, 2017
Achievement
Newbie

Achieved
Jan 13, 2017